If the coil is energized and generates a magnetic discipline, the core is attracted, which opens or closes the valve. Core Spring: Operating pressure, or Safe and sound working pressure, is the internal pressure variety of the program‘s operating condition. น้องปั๊มบ้านมีบริการซ่อม ติดตั้ง และจำหน่ายปั๊มน้ำ This attribute also signifies its fail-safe position. https://pressuregauge415825.wssblogs.com/15607894/top-guidelines-of-วาล-ว